Tire Size Finder (optional):
Stock Sizes
- 255/75-16
Plus Sizes
- 255/75-16
Accepts P-Metric and Inches
| 215/30-20 | 225/45-20 | Difference | |
|---|---|---|---|
| Diameter inches (mm) | 25.08 (637) | 27.97 (710.5) | 2.89 (73.5) 11.5% |
| Width inches (mm) | 8.46 (215) | 8.86 (225) | 0.39 (10) 4.7% |
| Circum. inches (mm) | 78.79 (2001.19) | 87.88 (2232.1) | 9.09 (230.91) 11.5% |
| Sidewall Height inches (mm) | 2.54 (64.5) | 3.99 (101.25) | 1.45 (36.75) 57% |
| Revolutions per mile (km) | 804.19 (499.7) | 721 (448.01) | -83.19 (-51.69) -10.3% |
Speedometer Difference
| Speedo Reading | Actual Speed |
|---|---|
| 20 mph (32.19 km/h) | 22.31 mph (35.9 km/h) |
| 25 mph (40.23 km/h) | 27.88 mph (44.88 km/h) |
| 30 mph (48.28 km/h) | 33.46 mph (53.85 km/h) |
| 35 mph (56.33 km/h) | 39.04 mph (62.83 km/h) |
| 40 mph (64.37 km/h) | 44.62 mph (71.8 km/h) |
| 45 mph (72.42 km/h) | 50.19 mph (80.78 km/h) |
| 50 mph (80.47 km/h) | 55.77 mph (89.75 km/h) |
| 55 mph (88.51 km/h) | 61.35 mph (98.73 km/h) |
| 60 mph (96.56 km/h) | 66.92 mph (107.7 km/h) |
| 65 mph (104.61 km/h) | 72.5 mph (116.68 km/h) |
| 70 mph (112.65 km/h) | 78.08 mph (125.65 km/h) |
| 75 mph (120.7 km/h) | 83.65 mph (134.63 km/h) |
| 80 mph (128.75 km/h) | 89.23 mph (143.6 km/h) |
| 85 mph (136.79 km/h) | 94.81 mph (152.58 km/h) |
| 90 mph (144.84 km/h) | 100.38 mph (161.55 km/h) |
| 95 mph (152.89 km/h) | 105.96 mph (170.53 km/h) |
| 100 mph (160.93 km/h) | 111.54 mph (179.5 km/h) |
| 2.35 | 2.73 | 2.94 | 3.07 | 3.21 | 3.31 | 3.42 | 3.55 | 3.73 | 3.91 | 4.11 | 4.27 | 4.56 | 4.88 | 5.13 | 5.29 | 5.38 | 5.71 | 6.17 | 7.17 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1835 | 2131 | 2295 | 2397 | 2506 | 2584 | 2670 | 2772 | 2912 | 3053 | 3209 | 3334 | 3560 | 3810 | 4005 | 4130 | 4201 | 4458 | 4817 | 5598 |
Better Fuel Economy Factory Ratios Increased Power
